If you experience lag on touchdown, try the following fix.
Why is this happening? - When you land and your wheels touchdown, that is when the Default Asobo ground services spawn in, you can verify and see for yourself by going into a small airport that obviously carries airliners (so its easier to find the ground services since theres only a few gates) You will find a marshaller and a pushback tug and possibly other things.
What is the fix? - Go into your aircraft.cfg file
- Community\fnx-aircraft-320\SimObjects\Airplanes\FNX_320_CFM\aircraft.cfg
- Community\fnx-aircraft-320\SimObjects\Airplanes\FNX_320_IAE\aircraft.cfg
Look for the word "Services" in brackets [Services]
Change all the values from 1 to 0 EXCEPT JETWAYS. This will prevent the default services from activating. Keep in mind you will need to do this for each plane you use and each variant you use because they all have their own aircraft.cfg and after each update.
And lastly,
Possible downside to this - People who do not use GSX Pro and use the toolbar pushback, will most likely need these services on (especially the pushback tug) But of course, feel free to edit it depending on what you do not use.
As always, it is recommended to make a backup of your original aircraft.cfg file.
For those who have tried the above solution but want a more nuclear option.
Go to [Your MSFS Packages Installation]\Official\Steam\asobo-services\AirportServices\Shared
There will be an .spb file on the bottom, Rename it to OFFServices.spb
For those who do not use GSX, this fix won't be beneficial as it disables every default ground service, stick to the first fix instead and disable the services you do not use.